The journey is complete, but what happens next? Greta highlighted Thursday night the arrival of two Marine Corps veterans in Washington, D.C., after their 300-mile walk in support of a U.S. Marine who has been jailed in Mexico for almost six months.

Vietnam veterans Terry Sharpe and his walking partner, Allen Brown, journeyed from Summerfield, North Carolina, with the intention of delivering a verbal message to President Obama.

They want the White House to ramp up its efforts to get Mexico to release the Marine, calling him an honorable American who made a mistake.

Sgt. Andrew Tahmooressi says he mistakenly crossed into Mexico with three legally-purchased and registered guns in his truck. Mexican authorities have continued to hold him on weapons violations through multiple court hearings.

For updates on the case of Sgt. Tahmooressi make sure to tune into "On the Record," weeknights at 7 ET.

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